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    Tytuł:
    Seasonal Variations of Sea Surface Temperature and Sea Current in the Celebes Sea
    Autorzy:
    Hapsari, Siti Nirmala
    Syamsuddin, Mega Laksmini
    Riyantini, Indah
    Sunarto, Sunarto
    Powiązania:
    https://bibliotekanauki.pl/articles/1031483.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Celebes Sea
    Sea Current
    Sea Surface Temperature
    Opis:
    The waters of the Celebes Sea are an area that has quite complex dynamics because it is influenced by several factors, either regionally or globally. This influence certainly has an impact on variations in oceanographic conditions in waters such as Sea Surface Temperature (SST) and sea currents. Currently, there are many observations of oceanographic data, one of which is by using remote sensing methods. The purpose of this study was to determine the seasonal variations in sea surface temperature and sea surface currents in the Celebes Sea using a remote sensing system in a time series for 5 years (2014-2018). The results of this study indicate data on seasonal variation of SST and sea surface currents have an average maximum SST value for 5 years occurring in the eastern season and the second transitional season (May, June, July) with an average value range of 30.6 °C - 31.1 °C and the average maximum sea current velocity for 5 years occurs in the western monsoon with a value range of 0.72 m/s - 0.77 m/s. The high SST value and sea current velocity are caused by the influence of the season which causes variations in the ongoing rainfall, also presumably due to the opposite direction between the monsoon wind and the direction of the main current flowing in the Celebes Sea.
    Źródło:
    World News of Natural Sciences; 2021, 35; 135-143
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Klimatyczny wskaźnik aktywności Prądu Labradorskiego
    Climatic index of Labrador Current activity
    Autorzy:
    Marsz, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/260933.pdf
    Data publikacji:
    2003
    Wydawca:
    Stowarzyszenie Klimatologów Polskich
    Tematy:
    prądy morskie
    Prąd Labradorski
    sea current
    Labrador Current
    Opis:
    Some of the sea currents show strong activity in climate formation and this fact is well known. Their activity represented as a time function is not stable but proves to be changeable. For this reason it seems quite reasonable to introduce appropriate indexes which could be used to characte-rise activity of a given current and, in an indirect way, to describe heat masses carried with this current. The aim of this article is to present an index which characterises the climatic activity of the Labrador Current. The basis to create such an index is the number of icebergs carried with this current. In consecutive ice seasons (October - September) this number passed south of 48°N of E from New Foundland (data from ?International Ice Patrol?). Changeable from year to year number of icebergs carried to the North Atlantic (see fig. 2) primarily represents the increase or decrease in the intensity of the Labrador Current. As the number of icebergs moved to the Atlantic comprises random component, which is very high, in order to create the index a logarythm was used to reduce the changeability of the amplitude. Formula [ 1 ] has been proposed to be used to calculate the index of intensity of the Labrador Current (WPL): WPL= (ln(G + 1))/2 where: ln - natural logarythm (base = e), G - the number of icebergs noted in a given ice season. Values of WPL index calculated in this way dated in January in ice season over a period 1900?2002 have been presented in Table 2 and their course in Fig. 3. The value of WPL indicates quite strong correlation with both winter (DJFM) and annual NAO indexes (r ~ 0.5), however the analysis showed that NAO is not the only element having influence on the Labrador Current activity. The analysis, carried out at random, of relations between the values of WPL and different climatic and hydroclimatic elements indicated to the fact that most of the relations are shifted/delayed in time - changeability of WPL takes place earlier than changes in these elements. For instance, the air temperature in August the following year in most area of Poland proves to have not too strong but clear correlation with the changes in WPL. Numerous correlations between WPL and occurring later monthly values of air temperature and monthly sums of precipitation at stations in the Atlantic sector of Arctica have been observed. The size of sea ice cover in the Barents Sea in the following year has shown especially high correlation with the changeability of WPL (the changeability of WPL explains ~50% of changeability in the area of the sea ice cover of the Barents Sea in January the following year). In this way WPL seems to be potentially useful in long term predictors of weather forecasts. The delayed activity of WPL can be explained by means of the following cause- and-effect chain of actions: winter (DJFM) atmpspheric circulation over the Davis Strait and the Labrador Sea has influence on the activity of the Labrador Current - the activity of the Labrador Current has influence on the extent and size of the anomalies in SST in the Labrador Sea and in NW part of the Atlantic (MJJA) - the presence of such anomalies in SST has a modifying effect on the atmospheric circulation occurring in the following autumn (SON) and winter (DJFM).
    Źródło:
    Problemy Klimatologii Polarnej; 2003, 13; 43-58
    1234-0715
    Pojawia się w:
    Problemy Klimatologii Polarnej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coherent current oscillations and water exchange in the straits of the Gulf of Riga
    Autorzy:
    Talpsepp, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/49149.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    current
    water exchange
    coherent current
    Riga Gulf
    Gulf of Riga Project
    Baltic Sea
    Opis:
    The water exchange processes through the Irbe and Virtsu (Suur) Straits were investigated in 1993–1997 within the framework of a five-year study programme – the Gulf of Riga Project. Simultaneous current measurement data from autonomous mooring stations in both straits were available for the analysis in two periods. In addition to the dominant signals – inertial oscillations in the Virtsu Strait and diurnal oscillations in the Irbe Strait – low-frequency oscillations were found in both straits. During the experiment in July–August 1994, 12–14-day oscillations were observed in both straits: the maximum phase lag in the Virtsu Strait was 1 day. The other important low-frequency periodic component in both straits was 88 hours. In this case, the phase lag in the Virtsu Strait was about 20 hours. In the 1995 experiment in the Irbe Strait, 42-hour oscillations were observed with a phase lag of 10–12 hours. The amplitude was about 30 cm s−1 in both straits. As in Lilover et al. (1998), where the flow regime in the Irbe Strait was observed, we can interpret these oscillations as being wind-generated. The present work shows the existence of these disturbances also in the Virtsu Strait. The 88-hour oscillations observed in July–August 1994 can be interpreted as the first mode of the basin’s eigenoscillations according to the concept of Otsmann et al. (1997) of a basin with two separate outlets. The lowest frequency oscillation with the period of 12–14 days seemed to propagate to the Gulf of Riga from the Baltic Proper, but the generating force could not be established because there was no noticeable variability between depressions and anticyclones during that period. Based on the current measurements, two types of water exchange through the Irbe strait were established: the outflow over the whole cross-section of the strait, and a bidirectional flow with an inflow near the southern shore and increasing inflow in the near-bottom layers and an outflow in the northern part of the strait.
    Źródło:
    Oceanologia; 2005, 47, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany temperatury powierzchni Morza Barentsa w latach 1951-2006
    Changes in the sea surface temperature of the Barents Sea in the years 1951-2006
    Autorzy:
    Zblewski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/260773.pdf
    Data publikacji:
    2007
    Wydawca:
    Stowarzyszenie Klimatologów Polskich
    Tematy:
    temperatura powierzchni morza
    NAO
    Morze Barentsa
    Prąd Zachodniospitsbergeński
    Prąd Nordkapski
    sea surface temperature
    Barents Sea
    West Spitsbergen Current
    North Cape Current
    Opis:
    Praca charakteryzuje zmiany temperatury powierzchni Morza Barentsa (TPM) zachodzące w okresie 1951–2006. Stwierdzono występowanie słabych, dodatnich i istotnych statystycznie trendów TPM w gridach leżących poza obszarem bezpośredniego oddziaływania ciepłych prądów morskich. Odnotowano słaby i nierównomiernie rozłożony w przestrzeni wzrost temperatury powierzchni morza – silniejszy we wschodniej części Morza Barentsa. W badanym okresie (1951–2006) na obserwowaną zmienność rocznej TPM znacznie silniejszy wpływ wywierają procesy oceaniczne niż zmienność zimowej cyrkulacji atmosferycznej.
    The aim of this work was to analyse monthly and annual values of sea surface temperatures of the Barents Sea in the years covering the period from 1951 up to 2006 averaged to chosen grids 2x2° (Fig. 1).The analysis showed that in the course of SST a clearly marked period (1976–1988) of significant decrease in annual values of water temperature was noted, with the minimum observed in 1980 (Fig. 2). This phenomenon is connected with Great Salinity Anomaly.The research showed that the general decrease in annual SST takes place towards north-east and at the same time, following the same direction, the increase in amplitude of inter-annual changes can be observed (Fig. 3). ‘The warm sources of the North Cape Current and West Spitsbergen Current moving away and the transfer of heat from the ocean to the atmosphere are the cause of this situation. This significant drop in annual sea surface temperature in the NE part of the Barents Sea is also influenced by flows of cold and fresh Surface Arctic Waters from the Arctic and Kara seas. There were also great differences observed in the course of annual SST in the western and eastern parts of the examined sea area. (Fig.4). In the eastern part rapid falls in water temperature can be noted by even 0.7°C from year to year. They result from the sea ice spreading and Surface Arctic Waters from the Kara Sea and from the north region of the Barents Sea which cut off the flow of heat from the deeper parts of the sea towards the surface and to the atmosphere.In the examined period weak positive trends in the annual sea surface temperature were observed and they are statistically significant in almost all grids (Tab.1). The strongest trends were noted in the east part of the examined sea area. Positive and statistically significant trends of the monthly SST are observed in summer and autumn in grids located farthest NE.The analysis showed that the influence of winter atmospheric circulation on the temperature of the sea surface is weak or rather moderate (Tab. 2) and that the observed changeability in annual sea surface temperature of the Barents Sea is mainly controlled by oceanic processes.
    Źródło:
    Problemy Klimatologii Polarnej; 2007, 17; 61-70
    1234-0715
    Pojawia się w:
    Problemy Klimatologii Polarnej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variability of currents over the southern slope of the Gulf of Finland
    Autorzy:
    Suhhova, I.
    Pavelson, J.
    Lagemaa, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/48946.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    stratification
    upwelling
    downwelling
    Finland Gulf
    coastal sea water
    seasonal thermocline
    current velocity
    Źródło:
    Oceanologia; 2015, 57, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thin chlorophyll layer concomitant of the thermohaline intrusion in the confluence of the Gulf Stream and Labrador Current (a case study)
    Autorzy:
    Karabashev, G.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/48303.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    fluorometer
    chlorophyll fluorescence
    sea water
    temperature
    coloured dissolved organic matter
    vertical distribution
    thermohaline
    sea water intrusion
    Labrador Current
    Źródło:
    Oceanologia; 2019, 61, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Large halocline variations in the Northern Baltic Proper and associated meso- and basin-scale processes
    Autorzy:
    Elken, J.
    Malkki, P.
    Alenius, P.
    Stipa, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/47628.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Sopot
    current
    splitting area
    Finland Gulf
    saline water
    conference
    Baltic Sea
    halocline
    Opis:
    The Northern Baltic Proper is a splitting area of the Baltic Sea saline water route towards the two terminal basins – the Gulf of Finland and the Western Gotland Basin. Large halocline variations (vertical isopycnal displacements of more than 20 m, intra-halocline current speeds above 20 cm s−1) appear during and following SW wind events, which rapidly increase the water storage in the Gulf of Finland and reverse the standard estuarine transport, causing an outflow in the lower layers. In the channel of variable topography, basin-scale barotropic flow pulses are converted into baroclinic mesoscale motions such as jet currents, sub-surface eddies and lowfrequency waves. The associated dynamics is analysed by the results from a special mesoscale experiment, routine observations and numerical modelling.
    Źródło:
    Oceanologia; 2006, 48, S
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Current observations from a looking down vertical V-ADCP: interaction with winds and tide? The case of Giglio Island (Tyrrhenian Sea, Italy)
    Autorzy:
    Cutroneo, L.
    Ferretti, G.
    Scafidi, D.
    Ardizzone, G.D.
    Vagge, G.
    Capello, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/47976.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    wind
    tide
    interaction
    sea level
    normalized cross-correlation function
    wind velocity
    current measurement
    Giglio Island
    Tyrrhenian Sea
    Italy
    Opis:
    In the context of the environmental monitoring of the Concordia wreck removal project, measurements of currents, winds and sea level height were made along the eastern coast of the Giglio Island, Tyrrhenian Sea (Italy), during 2012—2013. The aim of the study was to investigate the effect of atmospheric forcing and periodic sea-level changes on the coastal currents. Normalised Cross-Correlation Function analysis allowed us to correlate these observations. A marked inter-seasonal variability was found in both current and local wind velocity observations but a significant level of correlation between the data was only found during strong wind events. Current and wind directions appeared to be uncorrelated and current measurements showed a predominant NW—SE direction, presumably linked to the shape and orientation of Giglio Island itself. During strong winds from the SSE, current flow was towards the NNW but it suddenly switched from the NNW to the SE at the end of wind events. The results show that, at Giglio Island, currents are principally dominated by the general cyclonic Tyrrhenian circulation, and, secondly, by strong wind events. The sea level had no effects on the current regime.
    Źródło:
    Oceanologia; 2017, 59, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microplankton size structure induced by a warm-core eddy in the Western Bay of Bengal: Role of Trichodesmium abundance
    Autorzy:
    Chinnadurai, K.
    Retnamma, J.
    Nagarathinam, A.
    Subramanian, P.R.
    Singaram, P.
    Shoba, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078908.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    microplankton
    size structure
    biomass
    Trichodesmium
    sea surface temperature
    wind
    sea level
    geostrophic current circulation
    chlorophyll a
    Bengal Bay
    Opis:
    Mesoscale warm-core eddies are common in the Bay of Bengal (BoB), and this study in the western BoB during Pre-Southwest Monsoon (April 2015) presents how a prolonged warmcore core eddy could modify the microplankton biomass and size structure. To investigate this, field sampling and laboratory analyses were augmented with satellite data sets of sea surface temperature (SST), winds, mean sea level anomaly (MSLA), geostrophic currents and chlorophyll-a. High SST with positive MSLA (≥ 20 cm) and a clockwise circulation, represented the occurrence of a large warm-core eddy in the western BoB. Time series data evidenced that it was originated in the mid of March and persistent there till early June, which in turn caused a decrease in the surface nutrients and chlorophyll-a. The abundance and biomass of microplankton were negligible in the warm-core eddy region. FlowCAM data showed a significant decrease in the autotrophic microplankton parameters in the warm-core eddy (av. 13 ± 9 ind. L−1 and 0.1 ± 0.04 μgC L−1, respectively) as compared to the surrounding locations (av. 227 ± 143 ind. L−1 and 0.8 ± 0.5 μgC L−1, respectively). Low nutrients level in the warm core eddy region favoured high abundance of needle-shaped phytoplankton cells dominated by Trichodesmium cells. As a result, the size of micro-autotrophs in the warm-core eddy was larger (av. 91,760 ± 12,902 μm3 ind.−1) than its outside (av. 50,115 ± 21,578 μm3 ind.−1). This is a deviation from our belief that the oligotrophy decreases the phytoplankton size. We showed here that the above understanding might not be infallible in warm-core eddies in the northern Indian Ocean due to its inducing effect on the Trichodesmium abundance.
    Źródło:
    Oceanologia; 2021, 63, 3; 283-300
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synoptic changes in the deep rim current during stagnant hydrographic conditions in the Eastern Gotland Basin, Baltic Sea
    Autorzy:
    Hagen, E.
    Feistel, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/49138.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Gotland Basin
    hydrography
    deep water condition
    current measurement
    Baltic Sea
    Baltic Monitoring Programme
    Opis:
    Hydrographic and current measurements are analysed for stagnant deep-water conditions over the south-eastern topographic flank of the Eastern Gotland Basin (EGB) in April 2000. Results suggest a prevailing barotropic motion mode on a synoptic scale of several days. Deep along-slope volume transports derived from subsurface current meter moorings are compared with those of the baroclinic fraction of geostrophic motions crossing the plane of a hydrographic section. This was aligned perpendicular to deep isobaths and was repeated 40 times with a time step of six hours. Changes in regional winds produced a quasi-ten day cycle in the filling level of the Baltic Proper. Associated wave-like fluctuations of the mass field propagated cyclonically with a velocity of about 0.04 m s−1 around the deep basin’s rim. It is concluded that associated changes in deep volume transports result mainly from barotropically governed advection processes and that those of the baroclinic component of geostrophic currents provide a qualitatively and quantitatively quite inaccurate description of related transport fluctuations on a daily scale.
    Źródło:
    Oceanologia; 2007, 49, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany zlodzenia mórz Grenlandzkiego i Barentsa w świetle zmian wskaźnika intensywności Prądu Labradorskiego (1972-1994). Wstępne wyniki analizy
    Changes in sea ice cover of the Barents and Greenland seas in the light of changes of the Labrador Current intensity index (1973-1994). Preliminary result of analysis
    Autorzy:
    Styszyńska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/260876.pdf
    Data publikacji:
    2001
    Wydawca:
    Stowarzyszenie Klimatologów Polskich
    Tematy:
    pokrywa lodowa
    cyrkulacja atmosfery
    Prąd Labradorski
    Morze Grenlandzkie
    Morze Barentsa
    ice cover
    atmospheric circulation
    Labrador Current
    Greenland sea
    Barents Sea
    Opis:
    The Barents and Greenland seas are characterised by great seasonal and interannual changeability in the ice cover. Research carried out by many authors prove that the ice regime of these seas is influenced, to a great extent, by large scalę changes in atmospheric circulation and by the ocean surface circulation of the North Atlantic and the Arctic Ocean. Such correlations arę mainly of teleconnection type and show phase shifts (among others Mysak 1995, Deser et. al. 2000). One of the elements of the sea surface circulation of the Atlantic Ocean is the Labrador Current. The intensity of this current changes in time. In the periods when the Labrador Current becomes strong, its waters form vast anomalies in the sea surface temperaturę in the NW Atlantic. Further they spread eastwards along the north edge of the North Atlantic Current and with some delay, have influence on the atmospheric circulation in the central and east part of the North Atlantic (Marsz 1997, 1999). The way how the changes in the intensity of the Labrador Current influence the climate nas not been discovered yet. The intensity of this current can be defined by means of an index (WPL - Labrador Current Intensity lndex) established by Marsz (Internet). This work examines if there is direct correlatton between the changes in the sea-ice cover of the Barents and Greenland seas and the variability of the intensity index of the Labrador Current. The research madę use of homogenous data concerning a week-old sea ice cover observed at the analysed seas and the values of intensity index of the Labrador Current in the period January 1972 until December 1994 given by Marsz (obtained from NIC and NCDC - Asheville). It has been stated that over the examined 23-year period (1972-1994) the mean monthly the sea-ice cover in the Barents Sea indicates to strong correlation with the changes in the value of the intensity index of the Labrador Current (Table 1, Fig. 1). The changes in WPL result in the rhythm of changes in the sea-ice cover of the Greenland Sea only in winter (Table 2, Fig. 2). The occurrence of anomalies in the sea surface temperatures in the region SE of New Foundland seem to have great influence on the later formation (after few or several months) of the sea-ice cover in the Barents Sea (Fig. 1, 3. 4, formula 1-3). Changes in the intensity of Labrador Current in a given year explain 30% up to 50% changeability of the sea-ice cover developing in that sea from January to July in the following year (Table 1, Fig. 3). The area of the sea-ice cover in the Greenland Sea is mainly influenced by the intensity of the Transpolar Drift and East-Greenland Current transporting considerable amount of ice from the Arctic Ocean. Only during fuli winter season, from January to March, the correlation between the intensity of the Labrador Current and the sea-ice cover reaches statistical significance (Table 2). The results of the carried out analysis point to significant influence of advection factor on the sea-ice cover of the examined seas. In both analysed seas the phenomenon is connected to both the character and intensity of the Atlantic waters flow and to greater frequency of occurrence of specified forms of air circulation in the region of central and eastern part of the North Atlantic, possible at a given distribution of anomalies in surface waters of the North Atlantic.
    Źródło:
    Problemy Klimatologii Polarnej; 2001, 11; 93-104
    1234-0715
    Pojawia się w:
    Problemy Klimatologii Polarnej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Driving forces of sandy sediment transport beyond the surf zone
    Autorzy:
    Stella, M.
    Ostrowski, R.
    Szmytkiewicz, P.
    Kapinski, J.
    Marcinkowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/47878.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    sandy sediment
    sediment transport
    surf zone
    wave-current interaction
    roughness
    coastal zone
    Baltic Sea
    Źródło:
    Oceanologia; 2019, 61, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of landfast ice on the hydrography and circulation of the Baltic Sea coastal zone
    Autorzy:
    Merkouriadi, I.
    Lepparanta, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/49047.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Finland Gulf
    hydrography
    landfast ice
    circulation
    Baltic Sea
    coastal zone
    water temperature
    salinity
    current
    Źródło:
    Oceanologia; 2013, 55, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat and salt fluxes in the West Spitsbergen Current area in summer
    Autorzy:
    Piechura, J.
    Osinski, R.
    Petelski, T.
    Wozniak, S.B.
    Powiązania:
    https://bibliotekanauki.pl/articles/49050.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Spitsbergen Current
    temperature
    radiation flux
    energy flux
    heat flux
    sea surface
    salt flux
    ocean circulation
    Opis:
    Fluxes of radiation, sensible and latent heat, and fluxes of heat and salt within the upper layer of the ocean were calculated on the basis of measurements carried out in the area of the Norwegian-Atlantic and West Spitsbergen Currents during summer 2000. The sea surface radiation balance was calculated from direct measurements of downward and upward short-wave (solar) radiation, the net radiation fluxes and sea surface temperature. The daily doses of radiation energy reaching and leaving the sea surface were also estimated. To calculate the vertical heat fluxes in the atmospheric boundary layer the bulk parameterisation method was used. In most cases, the calculated heat fluxes were rather low, the average sensible heat flux was c. 10 Wm−2, and the latent heat flux about one order of magnitude higher; this is what could be expected in summer. Salt fluxes to the air in the process of aerosol production are very small and can be neglected. In summer the highest quantities of heat and salt are exchanged during mixing with surrounding waters. According to our measurements, Atlantic Water on its northward course from about 70◦N to 79◦ N loses about 100 TWof heat and 900 × 103 kg of salt. We thought it could be interesting to find out what happens to them. Some preliminary results of our investigation are presented here.
    Źródło:
    Oceanologia; 2002, 44, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ zmian temperatury wód w głównym nurcie Prądu Zachodniospitsbergeńskiego na temperaturę powietrza na Spitsbergenie Zachodnim (1982-2002)
    The influence of the changes in sea surface temperature in the West Spitsbergen Current on the air temperature at West Spitsbergen (1982-2002)
    Autorzy:
    Kruszewski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/260635.pdf
    Data publikacji:
    2005
    Wydawca:
    Stowarzyszenie Klimatologów Polskich
    Tematy:
    temperatura powierzchni oceanu
    Prąd Zachodniospitsbergeński
    temperatura powietrza
    Spitsbergen
    air temperature
    West Spitsbergen Current
    sea surface temperature
    Opis:
    Praca omawia związki temperatury powietrza na trzech stacjach Spitsbergenu Zachodniego z temperaturą wody powierzchniowej na akwenach położonych po zachodniej stronie wyspy - w nurcie Prądu Zachodniospitsbergeńskiego. Przeprowadzona analiza korelacji ciągów temperatury wody i powietrza wykazała istnienie między nimi istotnych statystycznie związków. Najwyższe współczynniki korelacji (osiągające nawet wartość +0.80) występują w okresie jesieni - między wartościami temperatury powietrza i wody z tego samego miesiąca. Związki pomiędzy roczną temperaturą powietrza a miesięcznymi wartościami temperatury wody są tylko nieznacznie słabsze. W niektórych przypadkach zmiany miesięcznej temperatury powierzchni wody objaśniają ponad 40% zmienności rocznej temperatury powietrza na Spitsbergenie.
    This work deals with correlations between SST in the West Spitsbergen Current and air temperature at Spitsbergen (Hornsund, Svalbard-Lufthavn and Ny Alesund). The strongest correlations SST with air temperature have been found in the southern part of the West Spitsbergen Current. In grid [76, 14] synchronic correlations (SST & air temperature in the same month) are strongest and most frequent, occurring in fall and winter months at all three stations (table 1). Correlations in summer months are strong only with closest station at Hornsund (r = 0.67 in July), and decrease with distance to the station. Synchronic correlations between monthly air temperature and SST in next two grids are less frequent and weaker. In [77, 10] grid statistically significant synchronic correlations are limited to fall and winter months and in [78, 06] grid occur in November only (see table 2 & 3). Correlations between monthly SST and annual air temperature are strongest for October, November and December in [76, 14] grid, and coefficients of correlation are very close for all three stations and months (0.62 < r < 0.70) - see Fig. 5. Interesting correlation occur between SST in April and May and annual air temperature values at Spitsbergen, especially strong at Ny Alesund and SST in May in [77, 10] grid (r = 0.66). The changeability of SST in this area in May explains from 31% (Hornsund) to 41% (Ny Alesund) of changeability in annual air temperature at Spitsbergen.
    Źródło:
    Problemy Klimatologii Polarnej; 2005, 15; 53-63
    1234-0715
    Pojawia się w:
    Problemy Klimatologii Polarnej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Periodic variability of currents induced by topographically trapped waves in the coastal zone in the Gulf of Finland
    Autorzy:
    Talpsepp, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/48759.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    trapped wave
    Sopot
    current
    water exchange
    Finland Gulf
    topographical wave
    Pakri Bay
    conference
    Baltic Sea
    Estonia
    Opis:
    The aim of this paper is to examine the water exchange regime between the bays of northern Estonia (Pakri Bay, Ihasalu Bay and Muuga Bay) and the open part of the Gulf of Finland. To this end, the current measurements and CTD-castings performed at the border of the bays and the open part of the Gulf of Finland in summer 1994, 1995–96 and 1997 are analysed. All the current measurements displayed one feature in common: the existence of periodic variability with a current amplitude of between 5 and 25 cm s−1 and a variability period of 3–4 days (68 hours in Pakri Bay, 72 hours in Muuga Bay and 78 hours in Ihasalu Bay). The amplitudes of this variability differed during different time periods of the experiment and in different parts of the southern Gulf of Finland. The hypothesis was propounded that this variability is the result of bottom-trapped waves, as had been found in many other regions of the Baltic Sea (Aitsam & Talpsepp 1982, Talpsepp 1983). To interpret the results of the measurements, a model of bottom-trapped waves for this region was used. This was the short-wave version of Huthnance’s (1978) numerical model of coastal-trapped waves, according to which the wave parameters for the experimental regions were calculated. Comparison of the model and the measurements implies that coastal-trapped waves do exist off the southern coast of the Gulf of Finland.
    Źródło:
    Oceanologia; 2006, 48, S
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation and species composition of stormcast beach wrack in the Gulf of Riga, Baltic Sea
    Autorzy:
    Suursaar, U.
    Torn, K.
    Martin, G.
    Herkul, K.
    Kullas, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/48538.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    beach wrack
    species composition
    wave
    current
    storm
    hydrodynamic modelling
    submerged vegetation
    biodiversity
    Riga Gulf
    Baltic Sea
    Źródło:
    Oceanologia; 2014, 56, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Waves, Currents and Seabed Level Change in the Port of Gdynia During Extreme Events
    Autorzy:
    Sapiega, P.
    Zalewska, T.
    Wochna, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201476.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    gulf of Gdansk
    sea wave
    hazard analysis
    Harbour areas
    transport from seabed
    hydrodynamic effects
    surface current
    hydrodynamic model
    Opis:
    The primary purpose of the paper is to identify port areas most exposed to extreme hydrodynamic conditions (waves, sea currents, seabed level change). The results of modelling using SWAN wave model, MIKE 3D model, and reanalysis and measurement data were used in paper. Swell may exceed 0.8 m for winds exceeding 15 m s-1 from the west and south. During extreme conditions, sea currents can reach 0.4 ms-1 in the outer part of the bay adjacent to the port. Port basins do not show changes in the thickness of the seabed for the given maximum values of bottom currents. The most extensive deposition of the seabed and shore sediments (up to 0.04 m) is found on the Gdynia-Oksywie beach adjacent to the port and the approach fairway at the offshore currents. The outer area of the main breakwater is the most exposed to erosive activity (-0.012 m).
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 3; 515--521
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A quasi phase-resolving model of net sand transport and short-term cross-shore profile evolution
    Autorzy:
    Ostrowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/48565.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    coastal zone
    hydrodynamics
    wave-current condition
    cross-shore profile
    Baltic Sea
    evolution
    modelling
    sand transport
    sediment transport
    hydrodynamic impact
    Opis:
    A way of modelling of the net sediment transport rate on a cross-shore profile and the resulting sea bed changes is presented. In the sediment transport computations, a three-layer model with a description of the bedload based on the water-soil mixture theory by Kaczmarek& Ostrowski (1998, 2002) is used. The modelling system is applied to wave-current conditions variable over the cross-shore profile, and determined using the computational frameworkof Szmytkiewicz (2002a, b). The sediment transport module incorporates the asymmetric wave approaches as proposed by Ostrowski (2002). Model simulations have been produced for uniformly sloped and multi-bar initial cross-shore profiles. Some of the model results are compared with the IBW PAN (Institute of Hydroengineering of the Polish Academy of Sciences) field data collected at the Coastal Research Station in Lubiatowo.
    Źródło:
    Oceanologia; 2003, 45, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sediment transport beyond the surf zone under waves and currents of the non-tidal sea: Lubiatowo (Poland) case study
    Autorzy:
    Ostrowski, R.
    Stella, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/241109.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    wave-induced nearbed oscillations
    sea currents
    wind-driven current
    sand grain diameter
    bed shear stress
    friction velocity
    sediment transport
    Opis:
    The paper deals with the sandy coastal zone at Lubiatowo in Poland (the south Baltic Sea). The study comprises experimental and theoretical investigations of hydrodynamic and lithodynamic processes in the coastal region located close to the seaward boundary of the surf zone and beyond the surf zone. The analysis is based on field data collected at the IBW PAN Coastal Research Station in Lubiatowo. The data consist of wind velocity reconstructed from the long-term wave climate, deep-water wave buoy records and sea bottom soil parameters. Nearbed flow velocities induced by waves and currents, as well as bed shear stresses are theoretically modelled for various conditions to determine sediment motion regimes in the considered area. The paper discusses the possibility of occasional intensive sediment transport and the occurrence of distinct sea bed changes at bigger water depths.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2016, 63, 1; 63-77
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the possibility of convective overturning in the Slupsk Furrow overflow of the Baltic Sea
    Autorzy:
    Zhurbas, V.
    Elken, J.
    Paka, V.
    Piechura, J.
    Chubarenko, I.
    Vali, G.
    Golenko, N.
    Shchuka, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/48298.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Baltic Sea
    deep water
    dense water
    density stratification
    gravity current
    numerical simulation
    saline water
    Slupsk Furrow
    transverse circulation
    water mass
    Opis:
    Closely spaced CTD transects across the Słupsk Furrow displayed a ‘downward- bending’ of salinity contours below the salinity interface on the southern flank due to a transverse circulation in the saline water overflow. Numerical simulation of a gravity current in an idealized channel with geometry, dimensions and initial density stratification all much the same as in the Słupsk Furrow was applied to verify whether the downward-bending could be transformed into an inverted density stratification. Some arguments in favour of the possibility of convective overturning due to the differential transverse advection beneath the gravity current, brought on by the numerical simulations, are discussed.
    Źródło:
    Oceanologia; 2011, 53, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aggregating sea surface hydrodynamic forecasts from multi-models for European seas
    Autorzy:
    Frishfelds, V.
    She, J.
    Murawski, J.
    Nielsen, J. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201473.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    weather research and forecasting
    search and rescue
    operational ocean forecasting
    European Satellite Systems
    surface current
    drifting sea surface temperature
    European waters
    Opis:
    Maritime information services supporting European agencies such as the FRONTEX require European‐wide forecast solutions. Following a consistent approach, regional and global forecasts of the sea surface conditions from Copernicus Marine Service and national met‐ocean services are aggregated in space and time to provide a European‐wide forecast service on a common grid for the assistance of Search and Rescue operations. The best regional oceanographic model solutions are selected in regional seas with seamless transition to the global products covering the Atlantic Ocean. The regional forecast models cover the Black Sea, Mediterranean Sea, Baltic Sea, North Sea and combine the North Sea – Baltic Sea at the Danish straits. Two global models have been added to cover the entire model domain, including the regional models. The aggregated product is required to have an update frequency of 4 times a day and a forecasting range of 7 days, which most of the regional models do not provide. Therefore, smooth transition in time, from the shorter timerange, regional forecast models to the global model with longer forecast range are applied. The set of parameter required for Search and Rescue operations include sea surface temperature and currents, waves and winds. The current version of the aggregation method was developed for surface temperature and surface currents but it will be extended to waves in latter stages. The method relies on the calculation of aggregation weights for individual models. For sea surface temperature (SST), near real‐time satellite data at clear‐sky locations for the past days is used to determine the aggregation weights of individual forecast models. A more complicated method is to use a weighted multi‐model ensemble (MME) approach based on best forecast features of individual models and possibly including near real time observations. The developed method explores how satellite observations can be used to assess spatially varying, near real time weights of different forecasts. The results showed that, although a MME based on multiple forecasts only may improve the forecast, if the forecasts are unbiased, it is essential to use observations in the MME approach so that proper weights from different models can be calculated and forecast bias can be corrected. It is also noted that, in some months, e.g., June in Baltic Sea, even SST was assimilated, the forecast still show quite high error. There are also visible difference between different Copernicus Marine Environment Monitoring Service (CMEMS) satellite products, e.g. OSTIA and regional SST products, which can lead different forecast quality if different SST observation products are assimilated.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 3; 533--541
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ zmian temperatury wód w Bramie Farero-Szetlandzkiej na temperaturę powietrza w Arktyce (1950-2005)
    The influence of changes of the water temperature in the Faeroe-Shetland Channel on the air temperature in Arctic (1950-2005)
    Autorzy:
    Marsz, A. A.
    Przybylak, R.
    Styszyńska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/260775.pdf
    Data publikacji:
    2007
    Wydawca:
    Stowarzyszenie Klimatologów Polskich
    Tematy:
    temperatura powierzchni oceanu
    temperatura powietrza
    Brama Farero-Szetlandzka
    Prąd Norweski
    Arktyka
    sea surface temperature
    air temperature
    Faeroe-Shetland Channel
    Norwegian Current
    Arctic
    Opis:
    Praca analizuje związki między wskaźnikiem charakteryzującym zasoby ciepła w wodach atlantyckich wprowadzanych do Prądu Norweskiego, a dalej przez Prąd Zachodniospitsbergeński i Prąd Nordkapski do Arktyki, a roczną temperaturą powietrza w Arktyce. Analizę związków przeprowadzono dla Arktyki jako całości oraz jej sektorów: atlantyckiego, syberyjskiego, pacyficznego kanadyjskiego i sektora Morza Baffina. Wykazano istnienie silnie rozciągniętych w czasie (od 0 do 9 lat opóźnienia) związków z temperaturą powietrza w całej Arktyce, potwierdzających istotny statystycznie wpływ zmian zasobów ciepła w wodach na zmiany temperatury powietrza w Arktyce. Związki regionalne wykazują silne zróżnicowanie - na wzrost zasobów ciepła niemal natychmiastowo reaguje temperatura powietrza w Arktyce Atlantyckiej, z 2-6 letnim opóźnieniem temperatura powietrza w Arktyce Kanadyjskiej. Związki z temperaturą powietrza w sektorach syberyjskim i pacyficznym nie przekraczają progu istotności statystycznej. Zmiany temperatury powietrza w sektorze Morza Baffina wyprzedzają w czasie zmiany zasobów ciepła w wodach atlantyckich wprowadzanych następnie do Arktyki. To ostatnie może stanowić przyczynę okresowości w przebiegu temperatury powietrza w niektórych częściach Arktyki i strefy umiarkowanej.
    Styszyńska (2005, 2007) has shown the existence of clear statistical relationships between heat contents in the waters of the Atlantic flowing towards the Arctic via the Norwegian, West Spitsbergen, and North Cape currents and the air temperature in Spitsbergen, Jan Mayen and Hopen between the years 1982 and 2002. These relationships extend in time: following rises in the heat content of the waters of the Norwegian Current, an increase in air temperature follows in the same year and the following year. Heat contents in the Atlantic waters flowing towards the Arctic are assessed according to the average sea surface temperature (SST) in the Faeroe-Shetland Channel (grid 62°N, 004°W) from January to April. These values are used to calculate a determining indicator such as FS1-42L, established as the average of two successive years: data from one year (k) and the year preceding it (k-1). The aim of this work is to investigate whether there are relationships between FS1-42L and the air temperature in both the whole of the Arctic and in individual Arctic sectors and, if so, what the character of these relationships is. The data analysed were a set of yearly air temperatures for the whole of the Arctic and for particular Arctic sectors (fig. 2) according to Przybylak (2007), as well as a set of monthly SST values including values calculated for the FS1-42L indicator (NOAA NCDC ERSST v.1; Smith and Reynolds, 2002). The primary methodology employed was Cross-Correlation Function Analysis. The FS1-42L was established as a first value, with the yearly air temperature used as a lagged value. The analysis was carried out for a 55-year period, from 1951 to 2005. The analysis showed that, taken as a whole, relationships between heat contents leading to the Arctic and air temperature over the whole of the Arctic (calculated from averages of individual sectors) were not particularly significant, though there was marked significance in these relationships from year 0 (fig. 3) to year +9 (fig. 4). The strongest relationships were those from the same year for which the FS1-42L was dated, after which relationships grew gradually weaker, until they finally disappeared in the tenth year. In the Atlantic sector of the Arctic the relationship was strong and almost immediate (fig 5). In the Siberian (fig. 6) and Pacific (fig. 7) sectors there was an absence of statistically significant relationships, and any that did exist were weak, with varying degrees of ?echo? in air temperature reactions. Air temperature in the Canadian sector (fig. 8) reacted to increases in heat contents with a delay of 2 to 6 years, with the strongest relations from FS1-42L being noted with a 5-year delay. The situation in Baffin Bay was entirely different, with air temperature changes preceding changes in the heat contents of the waters of the Faeroe-Shetland Channel by 1 to 6 years. The maximum strengths of these relations were -5 and -4 per year (fig. 9). Analysis of the reasons for these regional variations in the influence of FS1-42L on air temperature allows us to conclude that a major role is played by the bathymetry of the Arctic Ocean. Atlantic waters sinking beneath Arctic Surface Water (ASW) contribute to changes in the temperature of Arctic Intermediate Water (AIW). Independent of the routes taken by the processes, the influence of AIW on the air temperatures in the Siberian and Pacific sectors is limited, with these sectors being isolated by wide shelves from the Arctic Ocean. In the Canadian sector, which is separated by narrow shelves from deep-water parts of the Arctic Ocean and is situated a relatively short distance from the Atlantic sector, the influence of heat contents on the ASW is apparent, with a certain delay. Changes in the air temperature of the Baffin Bay sector are related to the variable activity of the Labrador Current, bringing cold waters to the North from the Gulf Stream delta. The force of strong cooling waters from the Labrador Current, with the appropriate delay, result in a lessening of the heat contents in the Faroe-Shetland Channel. Because of the fact that there is a strong positive correlation between the yearly air temperatures of the Canadian and Baffin Bay sectors, a chain of dependencies emerges: air temperature in the American sectors of the Arctic the flow of Atlantic waters FS1-42L air temperature in the Atlantic Arctic sector Ž air temperature in the Canadian sector should generate quasi-periodic (> 10 years) air temperature courses.
    Źródło:
    Problemy Klimatologii Polarnej; 2007, 17; 45-59
    1234-0715
    Pojawia się w:
    Problemy Klimatologii Polarnej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Waves, currents and sea level variations along the Letipea - Sillamäe coastal section of the Southern Gulf of Finland
    Autorzy:
    Suursaar, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/48913.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    wave
    variation
    hydrodynamic condition
    measurement
    Doppler current prolifer
    calibration
    semi-empirical hindcast
    water parameter
    upwelling
    coastal jet
    climate change
    Baltic Sea
    Letipea-Sillamae coastal section
    Finland Gulf
    Opis:
    Variations in the hydrodynamic conditions were studied on the basis of 336 days of measurements with a Doppler current profiler. With wave data as a calibration reference, a semi-empirical hindcast of wave parameters is presented in the fetch- limited near-shore area for the period 1966–2008. A resultant 4–6 cm s−1 westward current dominated along the coast. Occasional fast sub-surface westward currents under modest wind forcing, as well as asymmetrical vertical profiles for westward and eastward currents indicated the influence of upwelling-related baroclinic coastal jets. The average frequency of upwelling was estimated at 17%; some of the events were identified in near-homothermic winter conditions on the basis of salinity and multi-layer flow records. While the mean sea level trend at Narva-Jõesuu roughly approximated the global estimates for 1899–2009, the annual maximum sea level increase was 5–8 mm yr−1. Both mean and maximum wave heights declined as a result of decreasing winds from the north.
    Źródło:
    Oceanologia; 2010, 52, 3; 391-416
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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